function calcstrength(){
	if( markerpoints.length && PlanRoutePoints.length ){
		for( let i=1; i<markerpoints.length; i++ ){
			let lap = markerpoints[i]['lap'];
			let split = PlanRoutePoints[i-1][PlanRoutePoints[i-1].length-1]['tm']['split'];
			if( typeof lap=="number" && typeof split=="number" && split>0.0 ){
				if( Math.abs( lap-split )>1.0 ){
					let laps = 0;
					let mul = lap/split;
					for( let p of PlanRoutePoints[i-1] ){
						if( typeof p['tm']['lap']=="number" ){
							p['tm']['lap'] *= mul;
							laps += p['tm']['lap'];
						}
					}
					PlanRoutePoints[i-1][PlanRoutePoints[i-1].length-1]['tm']['split'] = laps;
				}
			}
		}
		let day = 0;
		let total_distance = 0;
		let c = Array();
		let distance = Array();
		let variation = Array();
		c[day] = 0;
		distance[day] = 0;
		variation[day] = 0;
		for( let i=0; i<markerpoints.length-1; i++ ){
			if( markerpoints[i]['code']=="VariationPoint" ){
				variation[day] = 1;
			}
			if( markerpoints[i]['type']==2 ){
				day++;
				c[day] = 0;
				distance[day] = 0;
				if( markerpoints[i]['code']=="VariationPoint" ){
					variation[day] = 1;
				} else {
					variation[day] = 0;
				}
			}
			let lon = null;
			let lat = null;
			let alt = null;
			for( let p of PlanRoutePoints[i] ){
				if( lon==null || lat==null ){
					lon = p['loc'][0];
					lat = p['loc'][1];
					alt = p['alt'];
				} else {
					if( typeof p['alt']=="number" && typeof alt=="number" ){
						let x = cf_distance_infcam( lat, lon, p['loc'][1], p['loc'][0] );
						let y = p['alt']-alt;
						if( x>=0.0 ){
							total_distance += x;
							distance[day] += x;
							let m = calcstrength_m( x, y );
							let lap = deftime( {'lat':lat,'lon':lon,'alt':alt}, {'lat':p['loc'][1],'lon':p['loc'][0],'alt':p['alt']}, 100 );
							if( !isNaN(lap) ){
								c[day] += m*lap;
							}
						}
					}
					lon = p['loc'][0];
					lat = p['loc'][1];
					alt = p['alt'];
				}
			}
		}
		if( markerpoints[markerpoints.length-1]['code']=="VariationPoint" ){
			variation[day] = 1;
		}
		total_distance = Math.round( total_distance/100 )/10;
		let str = "総歩行距離 "+total_distance.toFixed(1)+"km<div>";
		for( let day in c ){
			c[day] = Math.round( c[day]/4/60*100 )/100;
			let level = Math.floor( c[day]/5.0 );
			if( level<0 ) level = 0; else if( level>4 ) level = 4;
			level = String.fromCharCode( 0x31+level );
			let d = "<span class=\"strength_routelen\">"+(Math.round( distance[day]/100 )/10).toFixed(1)+"</span>";
			c[day] = "<div class=\"strength_list\"><div>"+(parseInt(day)+1)+"日目：</div><div>歩行距離＜"+d+"km＞／体力強度＜"+level+"＞";
//			c[day] += "<br>";
			if( variation[day] ){
				c[day] += "<div class=\"strength_attention\">一般ルート外を含むので適切な数値ではありません</div>";
			}
			c[day] += "</div></div>";
		}
		str += c.join("");
		str += "<div class=\"strength_note\" style=\"\">体力強度はルートの技術的難易度を含んでいません</div>";
		str += "</div>";
		$("#strength").html( str );
	} else {
		$("#strength").html( "" );
	}
}

var strength_r1 = Array(4.0, 5.0, 6.3, 8.0, 10.1, 12.5);
var strength_r2 = Array(4.0, 3.5, 3.5, 4.0, 5.0, 5.0);

function calcstrength_m( x, y ){
	if( x==0.0 ) return 0;
	let m;
	if( y>=0 ){// 上り
		let r = y*10/x;
		if( r>=5.0 ){
			m = strength_r1[5];
		} else {
			r0 = Math.floor(r);
			m = strength_r1[r0]+(strength_r1[r0+1]-strength_r1[r0])*(r-r0);
		}
	} else {//下り
		let r = -y*10/x;
		if( r>=5.0 ){
			m = strength_r2[5];
		} else {
			r0 = Math.floor(r);
			m = strength_r2[r0]+(strength_r2[r0+1]-strength_r2[r0])*(r-r0);
		}
	}
	return m;
}